含大规模风电场的电力系统小扰动稳定性研究  

Small Signal Stability Analysis of Power Grid Integrated With Large-Scale Wind Farm Composed of Doubly Fed Induction Generators

作　　者：贾宏杰[1] 王磊[1] 

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072

出　　处：《电网技术》2012年第10期61-69,共9页Power System Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2009CB219701;2010CB234608);高等学校博士学科点专项科研基金资助项目(20090032110064);天津市科技发展计划项目(09JCZDJC 25000)~~

摘　　要：重点研究了由双馈机组构成的风电场在并网运行时影响系统小扰动稳定性的一些因素,目的是寻求解释大规模双馈风机在故障中造成脱网运行的内在原因,并寻求应对策略。建立了双馈机组的电路模型、变频器模型、轴系模型及桨距角模型等;深入讨论了风电场与大电网联络紧密程度、风电场出力、风电场连接方式对系统小扰动稳定性的影响。研究发现,风电场与系统联络越弱,系统的小扰动稳定性越差;而风电场内部风电机组的连接方式也直接影响其小扰动稳定性。To seek the root cause of high capacity doubly fed induction generators（DFIGs） cascadingly tripped off from power grid and look for the countermeasures,major factors impacting on small signal stability during the operation of power grid integrated with large-scale wind farm composed of DFIGs is studied in detail.Firstly,dynamic models of DFIG were established in DIgSILENT/PowerFactory,including converter（rectifier and inverter） model,shaft model,pitch controller model and so on;then the impacts of tightness of integration weighed by length of transmission line connecting wind farm to power grid,the output of wind farm,and the inner connection schemes of DFIGs inside the wind farm on small signal stability of power grid was discussed in depth.The simulation of single-machine infinite bus system and New England 39-bus system,both of them are integrated with DFIG-based wind farm respectively,was performed,and simulation results show that the weaker wind farm connection of the grid system,the worse the system small signal stability;the inner connection schemes of DFIGs also directly impact on the small signal stability.

关 键 词：风电场 双馈异步发电机 小扰动稳定 联络紧密程度 接线方式 

分 类 号：TM715[电气工程—电力系统及自动化]